Disappering Items

[Mouth]

I handed 5 bags full of Necro Research Words to my friend so he could help me mule. I logged on to my mule, and he handed me the 5 bags. I already had 8 bags on my guy, so the 5 bags went on to my courser. I zoned in to the bank and placed the bags in to my bank slots. All 5 bags were there, but the words had disappeared from 4 out of the 5 bags. Please help!

This happened on character name "Dotting"